CN215177011U - Air preheating device directly heated by using cement kiln flue gas - Google Patents

Abstract

The utility model relates to an air preheating device directly heated by cement kiln flue gas, which comprises an SP boiler, an air primary heater, a kiln tail high-temperature fan, a flue gas high-temperature fan, a fan and an incinerator flue gas heating unit for secondary heating; an inlet of the SP boiler is communicated with a main pipeline, the main pipeline is connected with a flue gas inlet of an air primary heater through a bypass pipeline, a pipeline control valve is arranged on the bypass pipeline, a flue gas outlet of the air primary heater is connected with an air inlet of a flue gas high-temperature fan, an air inlet of the air primary heater is connected with an air outlet of a supply fan, and an air outlet of the air primary heater is connected with an incinerator flue gas heating unit; the outlet of the SP boiler is connected with the air inlet of a kiln tail high-temperature fan, and the air outlet of the flue gas high-temperature fan is connected with the air outlet of the kiln tail high-temperature fan; the method removes the heat of redundant flue gas in the kiln head, effectively enhances the combustion stability of the subsequent incinerator, and is beneficial to reducing the necessity of SP boiler transformation.

Description

Air preheating device directly heated by using cement kiln flue gas

Technical Field

The utility model belongs to the technical field of the air preheating device technique and specifically relates to indicate an utilize air preheating device of cement kiln flue gas direct heating, mainly be applied to cement kiln and deal with domestic waste in coordination.

Background

China is in the historical stage of advancing from industrial culture to ecological culture, and still many ecological problems need to be solved urgently. In recent years, the country puts the solid waste pollution prevention and control at the prominent position of ecological civilization construction, and the domestic waste treatment is an important link of the solid waste pollution prevention and control. At present, the main treatment modes of domestic garbage in China are sanitary landfill and garbage incineration power generation, the domestic garbage is treated by the cooperation of a cement kiln to supplement the sanitary garbage and the garbage, and particularly, the treatment of small-scale domestic garbage is more and more emphasized. The domestic garbage is treated by the cooperation of the cement kiln, so that the reduction, harmlessness and recycling of the domestic garbage treatment can be thoroughly realized, and a new way is opened for the development of circular economy and the creation of green and environment-friendly cement industry in the cement industry.

In the existing cement kiln co-disposal household garbage system, a preheating device is often needed. Most of the existing preheating devices have the following defects: it is difficult to get rid of unnecessary flue gas heat in the kiln head, leads to burning stability poor in burning furnace.

Therefore, in the patent application of the present invention, the applicant has elaborately studied an air preheating device directly heated by using the flue gas of the cement kiln to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses exist not enough to above-mentioned prior art, main aim at provides an utilize air preheater of cement kiln flue gas direct heating, and it gets rid of unnecessary flue gas heat in the kiln head, effectively strengthens the follow-up stability of burning furnace that burns, simultaneously, is favorable to reducing the necessity that the SP boiler reformed transform.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an air preheating device directly heated by using cement kiln flue gas comprises an SP boiler, an air primary heater, a kiln tail high-temperature fan, a flue gas high-temperature fan, a fan for pumping odor from a garbage warehouse or supplying air to the outside, and an incinerator flue gas heating unit for secondary heating;

the inlet of the SP boiler is communicated with a main pipeline, the main pipeline is connected with a flue gas inlet of an air primary heater through a bypass pipeline, a pipeline control valve is arranged on the bypass pipeline, a flue gas outlet of the air primary heater is connected with an air inlet of a flue gas high-temperature fan, an air inlet of the air primary heater is connected with an air outlet of a fan, and an air outlet of the air primary heater is connected with an incinerator flue gas heating unit; and the outlet of the SP boiler is connected with the air inlet of the kiln tail high-temperature fan, and the air outlet of the flue gas high-temperature fan is connected with the air outlet of the kiln tail high-temperature fan.

As a preferable scheme, the incinerator flue gas heating unit comprises an air secondary heater, a circulating fan, a circulating pipeline, an inlet pipeline connected with the incinerator and an outlet pipeline connected with the incinerator;

the air outlet of air secondary heater and air primary heater, be provided with the inlet valve on the entry pipeline, the entry pipeline links to each other with air secondary heater's flue gas entry, air secondary heater's flue gas outlet links to each other with circulating fan's air intake, and circulating fan's air outlet links to each other with the export pipeline, be provided with the outlet valve on the export pipeline, the export pipeline passes through circulating line and links to each other with the entry pipeline, the last circulating valve that is provided with of circulating line.

Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly:

the cold air is directly heated by the flue gas at the tail of the bypass kiln through the air primary heater by matching the bypass pipeline, the air primary heater, the air supply fan and the SP boiler, so that the redundant flue gas heat in the kiln head is removed, the combustion stability of a subsequent incinerator is effectively enhanced, and meanwhile, the air primary heater and the SP boiler are arranged in parallel, so that the necessity of modification of the SP boiler is favorably reduced;

and through the structural design of the incinerator flue gas heating unit, the high-temperature flue gas in the incinerator can be recycled and mixed with the newly-discharged high-temperature flue gas to heat the hot air discharged from the air heating system again, the size of the flue gas heat of the incinerator is reduced, the temperature of the flue gas entering the decomposing furnace subsequently is ensured not to be too low, and then the interference on the incineration of the decomposing furnace is reduced.

To more clearly illustrate the structural features and effects of the present invention, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

The reference numbers illustrate:

11. SP boiler 111, kiln tail high temperature fan

112. Main pipe 113, bypass pipe

114. Pipeline control valve

12. Air primary heater 121 and flue gas high-temperature fan

13. Air supply fan 14 and incinerator flue gas heating unit

141. Air secondary heater 142 and circulating fan

143. Circulation line 144, inlet line

145. Outlet pipe 146, inlet valve

147. Outlet valve 148, circulation valve.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

As shown in figure 1, an air preheating device directly heated by using cement kiln flue gas is mainly applied to the cement kiln for cooperatively treating domestic garbage, and comprises an SP boiler 11, an air primary heater 12, a kiln tail high-temperature fan 111, a flue gas high-temperature fan 121, a fan 13 for exhausting odor from a garbage warehouse or supplying air to the outside, and an incinerator flue gas heating unit 14 for secondary heating;

the inlet of the SP boiler 11 is communicated with a main pipeline 112, the main pipeline 112 is connected with a flue gas inlet of the primary air heater 12 through a bypass pipeline 113, a pipeline control valve 114 is arranged on the bypass pipeline 113, a flue gas outlet of the primary air heater 12 is connected with an air inlet of a flue gas high-temperature fan 121, an air inlet of the primary air heater 12 is connected with an air outlet of a fan 13, kiln tail flue gas is directly heated to gas at the fan 13 through the primary air heater 12, then, redundant flue gas heat in a subsequent kiln head is removed, and the combustion stability of the subsequent incinerator is enhanced. At the same time, the SP boiler 11 is connected with

The air outlet of the air primary heater 12 is connected with an incinerator flue gas heating unit 14; the outlet of the SP boiler 11 is connected with the air inlet of the kiln tail high-temperature fan 111, and the air outlet of the flue gas high-temperature fan 121 is connected with the air outlet of the kiln tail high-temperature fan 111.

In the present embodiment, the incinerator flue gas heating unit 14 includes an air secondary heater 141, a circulating fan 142, a circulating pipe 143, an inlet pipe 144 for connecting to the incinerator, and an outlet pipe 145 for connecting to the incinerator;

the air inlet of the air secondary heater 141 and the air outlet of the air primary heater 12, and the air outlet of the air secondary heater 141 can be connected with the grate furnace through a blower to be used as combustion-supporting air of the grate furnace.

The inlet pipe 144 is provided with an inlet valve 146, the inlet pipe 144 is connected with a smoke inlet of the air secondary heater 141, a smoke outlet of the air secondary heater 141 is connected with an air inlet of the circulating fan 142, an air outlet of the circulating fan 142 is connected with an outlet pipe 145, the outlet pipe 145 is provided with an outlet valve 147, the outlet pipe 145 is connected with the inlet pipe 144 through a circulating pipe 143, and the circulating pipe 143 is provided with a circulating valve 148.

The utility model relates to a main points lie in: the cold air is directly heated by the flue gas at the tail of the bypass kiln through the air primary heater by matching the bypass pipeline, the air primary heater, the air supply fan and the SP boiler, so that the redundant flue gas heat in the kiln head is removed, the combustion stability of a subsequent incinerator is effectively enhanced, and meanwhile, the air primary heater and the SP boiler are arranged in parallel, so that the necessity of modification of the SP boiler is favorably reduced;

and through the structural design of the incinerator flue gas heating unit, the high-temperature flue gas in the incinerator can be recycled and mixed with the newly-discharged high-temperature flue gas to heat the hot air discharged from the air heating system again, the size of the flue gas heat of the incinerator is reduced, the temperature of the flue gas entering the decomposing furnace subsequently is ensured not to be too low, and then the interference on the incineration of the decomposing furnace is reduced.

Claims (2)

1. The utility model provides an utilize air preheating device of cement kiln flue gas direct heating which characterized in that: comprises an SP boiler, an air primary heater, a kiln tail high-temperature fan, a flue gas high-temperature fan, a fan for pumping odor from a garbage storehouse or supplying air from the outside, and an incinerator flue gas heating unit for secondary heating;

the inlet of the SP boiler is communicated with a main pipeline, the main pipeline is connected with a flue gas inlet of an air primary heater through a bypass pipeline, a pipeline control valve is arranged on the bypass pipeline, a flue gas outlet of the air primary heater is connected with an air inlet of a flue gas high-temperature fan, an air inlet of the air primary heater is connected with an air outlet of a fan, and an air outlet of the air primary heater is connected with an incinerator flue gas heating unit; and the outlet of the SP boiler is connected with the air inlet of the kiln tail high-temperature fan, and the air outlet of the flue gas high-temperature fan is connected with the air outlet of the kiln tail high-temperature fan.

2. The air preheating device directly heated by using the cement kiln flue gas as claimed in claim 1, wherein: the incinerator flue gas heating unit comprises an air secondary heater, a circulating fan, a circulating pipeline, an inlet pipeline and an outlet pipeline, wherein the inlet pipeline is used for being connected with the incinerator;

the air outlet of air secondary heater and air primary heater, be provided with the inlet valve on the entry pipeline, the entry pipeline links to each other with air secondary heater's flue gas entry, air secondary heater's flue gas outlet links to each other with circulating fan's air intake, and circulating fan's air outlet links to each other with the export pipeline, be provided with the outlet valve on the export pipeline, the export pipeline passes through circulating line and links to each other with the entry pipeline, the last circulating valve that is provided with of circulating line.

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